

// option_result_test




pub fn test_fn(){
    let result_ok: Result<i32, &str> = Ok(302);
    println!("Result<i32, &str>.OK.unwrap():{:?}", result_ok.unwrap());
    let result_err: Result<i32, &str> = Err("some thiong wrong");
    println!("Result<i32, &str>.Err.unwrap_err():{:?}", result_err.unwrap_err());
    let box_5 = Box::new(5);
    println!("let x = Box::new(5); let y = Box::leak(x) = {:?}", Box::leak(box_5));
}


